#!/usr/bin/env bash
# Migra recordings + Garage da volumi Docker al disco video (es. /media/videos/matchlivetv).
# Uso: sudo bash scripts/migrate_videos_storage.sh
# Richiede: docker compose prod fermo o in fase di stop; disco montato su MATCHLIVETV_VIDEOS_ROOT.
set -euo pipefail

ROOT="$(cd "$(dirname "$0")/.." && pwd)"
cd "$ROOT"

VIDEOS_ROOT="${MATCHLIVETV_VIDEOS_ROOT:-/media/videos/matchlivetv}"
COMPOSE_FILE="${COMPOSE_FILE:-docker-compose.prod.yml}"
ENV_FILE="${ENV_FILE:-${ROOT}/.env}"
PROJECT="${COMPOSE_PROJECT_NAME:-infra}"

VIDEOS_MOUNT="$(dirname "$VIDEOS_ROOT")"
if ! mountpoint -q "$VIDEOS_MOUNT" 2>/dev/null && [ ! -d "$VIDEOS_ROOT" ]; then
  echo "ERRORE: disco video non montato (atteso ${VIDEOS_MOUNT})"
  exit 1
fi

echo "Destinazione: ${VIDEOS_ROOT}"
df -h "$VIDEOS_ROOT" 2>/dev/null || df -h "$VIDEOS_MOUNT"

fs_mkdir() {
  if mkdir -p "$@" 2>/dev/null; then
    return 0
  fi
  sudo mkdir -p "$@"
}

fs_rsync() {
  if rsync -aH "$@" 2>/dev/null; then
    return 0
  fi
  sudo rsync -aH "$@"
}

fs_mkdir "${VIDEOS_ROOT}/recordings" "${VIDEOS_ROOT}/garage/meta" "${VIDEOS_ROOT}/garage/data"
if [ ! -w "$VIDEOS_ROOT" ]; then
  sudo chown -R "$(id -un)":"$(id -gn)" "$VIDEOS_ROOT"
fi

volume_path() {
  local mp
  mp="$(docker volume inspect "${PROJECT}_$1" --format '{{ .Mountpoint }}' 2>/dev/null || true)"
  [ -n "$mp" ] && [ -d "$mp" ] && echo "$mp" && return 0
  mp="$(sudo docker volume inspect "${PROJECT}_$1" --format '{{ .Mountpoint }}' 2>/dev/null || true)"
  [ -n "$mp" ] && echo "$mp"
}

copy_volume() {
  local vol="$1" dest="$2"
  local src
  src="$(volume_path "$vol")"
  if [ -z "$src" ] || [ ! -d "$src" ]; then
    echo "Volume ${PROJECT}_${vol} assente, salto copia verso ${dest}"
    return 0
  fi
  if [ -n "$(sudo ls -A "$dest" 2>/dev/null || true)" ]; then
    echo "Già presente in ${dest}, salto copia da ${src}"
    return 0
  fi
  echo "Copia ${src} → ${dest}..."
  fs_rsync "${src}/" "${dest}/"
}

echo "Arresto servizi che usano recordings/Garage..."
docker compose -f "$COMPOSE_FILE" --env-file "$ENV_FILE" stop mediamtx sidekiq rails garage

copy_volume recordings "${VIDEOS_ROOT}/recordings"
copy_volume garage_meta "${VIDEOS_ROOT}/garage/meta"
copy_volume garage_data "${VIDEOS_ROOT}/garage/data"

if ! grep -q '^MATCHLIVETV_VIDEOS_ROOT=' "$ENV_FILE" 2>/dev/null; then
  echo "MATCHLIVETV_VIDEOS_ROOT=${VIDEOS_ROOT}" >> "$ENV_FILE"
  echo "Aggiunto MATCHLIVETV_VIDEOS_ROOT a ${ENV_FILE}"
fi

if [ -d "${ROOT}/garage/garage.prod.toml" ]; then
  echo "ERRORE: ${ROOT}/garage/garage.prod.toml è una directory (bind mount Docker corrotto)."
  echo "Rimuovi la directory e ripristina il file TOML prima di continuare."
  exit 1
fi

echo "Riavvio stack..."
docker compose -f "$COMPOSE_FILE" --env-file "$ENV_FILE" up -d --force-recreate mediamtx garage rails sidekiq

echo "Ridimensiono capacità Garage sul disco video..."
export MATCHLIVETV_VIDEOS_ROOT="$VIDEOS_ROOT"
bash "${ROOT}/scripts/garage_set_capacity.sh"

echo "Verifica mount:"
docker compose -f "$COMPOSE_FILE" --env-file "$ENV_FILE" exec -T rails \
  bundle exec rails runner \
  'puts({recordings: `du -sh /recordings 2>/dev/null`.strip, storage: Recordings::Storage.new.backend_name}.inspect)'

echo "Fatto. Volumi Docker obsoleti (rimuovi dopo verifica):"
for v in recordings garage_data garage_meta; do
  docker volume inspect "${PROJECT}_${v}" --format '{{ .Name }} ({{ .Mountpoint }})' 2>/dev/null || true
done
echo "  docker volume rm ${PROJECT}_recordings ${PROJECT}_garage_data ${PROJECT}_garage_meta"